Design Guide
​
Material used : Silicone rubber
Function :Establish contact between the LCD & PCB .
All elastomeric inter-connectors are 'custom made' Zebra connectors offer a wide variety of application possibilities. Unlike other connectors, they do not entail soldering to make reliable connections. They require a minimum of installation hardware considerations, allowing for very small packaging structures to support low profile display and microelectronic interfacing.
When properly dimensioned, long-life performance can be assured and airtight connections without additional precautions can be realized.
​
​
​
​
​
​
​
Pitch of Inter-Connector(P)
​
- More than three (3) conductive contacts per electrode of PCB/LCD.
- Distance from center-center of each conductor in a connector
- Alternate layers of insulation width (i) & conductor width (c) silicone material evenly spread over the entire length of inter-connector.
- e.g. Pitch (0.1 mm) = i (0.05 mm) + c (0.05 mm)
- Basically, 2 conductors per electrode are often adequate, but 3 conductors per electrode are always recommended to ensure reliable connections and to eliminate "intermittent contact"
- e.g. LCD pitch = 1.2 mm (with contact pad 0.6 mm) Inter-connector pitch = 0.18 mm is recommended"
​
​
​
​
​
​
​
Inter-Connector - Length(L)
​
-
L > Length of LCD pads : ±0.2mm or above
-
The overall length is recommended to be extended a min. of 0.5mm beyond the edge of the contact at each end of the connector.
Inter-Connector - Width(W)
​
-
W ≤ width of LCD ledge.
-
Its design is critical in eliminating buckle when clamping force is applied to the connector.
-
If the buckle is too severe, contact shall lost completely.
-
If connector width is too thin, it may require holder to facilitate assembly, prevent accidental side contact & eliminate alignment problems.
Inter-Connector - Uncompressed Height(H)
​
-
Connector height is determined by the separation distance between LCD & PCB, including tolerance variations.
-
It is critical to calculate the correct compression ( deflection rate ) to be applied to the connector for reliable connections.
-
Compression ( deflection rate ) to be applied to connectors varies with different types, dimensions of inter-connectors.
-
Generally speaking, compression set for inter-connector is ~ 10 - 15%
-
Guideline for reference :
-
H < 6 mm, ~ 15% compression of connector's height
-
6 mm < H < 10 mm, ~ 13% compression of connector's height
-
≥10 mm, ~ 10% compression of connector's height
-
X = n / 1 - p Formula to determine the uncompressed height of the connector
-
-
x = uncompressed height
-
n = compressed height (= separation distance between LCD & PCB)
-
p = percent of desired compression
​
-
Compression load should be spread evenly over the top surface of the inter-connectors.
-
To avoid bending, we recommend to use holders especially for tall height inter-connector.
-
Holder should give space for horizontal expansion of the inter-connector during compression
​
​
​
​
​
​
​
Conductive Core Width
-
Conductive width is important in determining the cost, resistance and hardness of the connector.
-
For connector width > 1.3 mm, the more conductive material a connector contains, the more expensive it is.
-
Standard core width = 0.6 mm
Applications
Design Guide
-
Pitch (P): More than three (3) conductive contacts per electrode of PCB/LCD
-
Length (L) : + 2mm or above
-
Uncompressed Height (H) : Distance between LCD & PCB +10-15% compression rate
-
Width (W) : determined by the width of LCD ledge
​
​
​
​
​
​
​
​
